Country: United States
Survey Organization: Princeton Survey Research Associates International
Field Dates: July 22–December 14, 2014
Sample: A random, nationally representative sample of 6,027 adults age 19 and older living in the continental United States.
Sample Size: A combination of landline and cellular phone random-digit dial (RDD) samples was used to reach people.
This report limits the analysis to respondents ages 19 to 64 (n=4,251). Statistical results are weighted to correct for the stratified sample design, the overlapping landline and cellular phone sample frames, and disproportionate nonresponse that might bias results. The resulting weighted sample is representative of the approximately 182.8 million U.S. adults ages 19 to 64.
The survey has an overall margin of sampling error of +/– 2 percentage points at the 95 percent confidence level. The landline portion of the survey achieved a 15.8 percent response rate and the cellular phone component achieved a 13.6 percent response rate.
Interview Method: The survey consisted of 25-minute telephone interviews in either English or Spanish and was conducted among a random, nationally representative sample of 6,027 adults age 19 and older living in the continental United States.